feat(#1102): add list_invites and join_room to matrix MCP

hive-matrix-mcp/src/bin/mcp.rs

@@ -118,6 +118,15 @@ struct ReadRoomArgs {
     limit: Option<usize>,
 }
 
+#[derive(Debug, Deserialize, JsonSchema)]
+struct ListInvitesArgs {}
+
+#[derive(Debug, Deserialize, JsonSchema)]
+struct JoinRoomArgs {
+    /// Matrix room id (`!abc:server`) or canonical alias (`#name:server`).
+    room: String,
+}
+
 struct MatrixBridge {
     #[allow(dead_code)]
     tool_router: rmcp::handler::server::router::tool::ToolRouter<Self>,
@@ -210,6 +219,24 @@ impl MatrixBridge {
         render(round_trip(DaemonRequest::ListRooms).await)
     }
 
+    #[tool(
+        description = "List rooms this agent has been invited to but not yet joined. \
+            Each row has the room id, canonical alias (when set), and display name. \
+            Use `join_room` to accept an invite."
+    )]
+    async fn list_invites(&self, Parameters(_): Parameters<ListInvitesArgs>) -> String {
+        render(round_trip(DaemonRequest::ListInvites).await)
+    }
+
+    #[tool(
+        description = "Join a matrix room by id (!abc:server) or alias (#name:server). \
+            Accepts a pending invite if one exists; also joins public rooms. \
+            After joining the room will appear in `list_rooms`."
+    )]
+    async fn join_room(&self, Parameters(args): Parameters<JoinRoomArgs>) -> String {
+        render(round_trip(DaemonRequest::JoinRoom { room: args.room }).await)
+    }
+
     #[tool(
         description = "List the members of a matrix room (joined-state only). \
             Each row carries the user id and resolved display name."
@@ -237,8 +264,10 @@ impl MatrixBridge {
         specific user, `send_reaction` to react with an emoji, `send_reply` \
         to thread a reply, `mark_read` to acknowledge an event. Discover \
         rooms with `list_rooms`, members with `list_room_members`, recent \
-        timeline with `read_room`. Room references accept ids (!abc:server) \
-        or aliases (#name:server); user references use @user:server.")]
+        timeline with `read_room`. See pending invites with `list_invites`; \
+        accept an invite or join a public room with `join_room`. Room \
+        references accept ids (!abc:server) or aliases (#name:server); \
+        user references use @user:server.")]
 impl ServerHandler for MatrixBridge {}
 
 #[tokio::main]